columnTitle = "ZY"
def titleToNumber(columnTitle):
    dictionary={'A':1,'B':2,"C":3,'D':4,'E':5,'F':6,'G':7,'H':8,'I':9,'J':10,'K':11,'L':12,'M':13
                ,'N':14,'O':15,'P':16,'Q':17,'R':18,'S':19,'T':20,'U':21,'V':22,'W':23,
                'X':24,'Y':25,'Z':26}

    columnTitleLen=len(columnTitle)
    print(columnTitleLen)
    powNum=0
    ans=0
    while powNum<columnTitleLen:
        ans+=dictionary[columnTitle[powNum]]*pow(26,columnTitleLen-powNum-1)
        powNum+=1
    return ans

print(titleToNumber(columnTitle))